Current load is the amount of electrical current that is passed from a power source to the device or appliance receiving the power. While ,Normally, the nameplate current rating is the amount of line current drawn from the source when the motor is running at full horsepower load. Typically the line current will be less, if the motor is not fully loaded. With no load on the motor, the current will be much less than the nameplate rating.
For 3 phase motors, a rule of thumb for calculating currents is HP x 746 / VAC x efficiency (.86 typ.). Overloads should be selected according to the duty or class of operation the motor will be subjected to.